(INDIANAPOLIS) - A Maryland man is expected to plead guilty in Indianapolis to charges accusing him of blackmailing a 16-year-old into making porn videos of herself.

Federal prosecutors say a Brownsburg girl exposed herself on a webcam site. A week later, she started getting emails from 20-year-old Trevor Shea, who allegedly threatened to post the images to the internet unless she sent him more.

Shea faces a minimum of 15 years. The fact some of the crimes occurred while Shea was out on bond in the Brownsburg case could add as much as 30 years to his sentence, making the maximum possible sentence 240 years.